MEDIUM
CVE-2023-26551
CWE-787Published: April 11, 2023· Updated: Jun 17, 2026
5.6
CVSS v3.1
Official Description
mstolfp in libntp/mstolfp.c in NTP 4.2.8p15 has an out-of-bounds write in the cp<cpdec while loop. An adversary may be able to attack a client ntpq process, but cannot attack ntpd.
Technical Analysis
CVE-2023-26551 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.
The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.
From a weakness classification perspective (CWE-787): Out-of-bounds write vulnerabilities can lead to data corruption, crashes, or arbitrary code execution.
CVSS v3.1 Vector Breakdown
Exploitability
Attack VectorNetwork
Attack ComplexityHigh
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityLow
IntegrityLow
AvailabilityLow
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L
Affected Vendors & Products
ntp1 product(s)
ntp
Source: NVD CPE · 1 total CPE entries
Exploit & PoC Resources
NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.
Official Patches & Advisories
All References (4)
→
https://github.com/spwpun/ntp-4.2.8p15-cves/blob/main/CVE-2023-26551Third Party Advisory
→
https://github.com/spwpun/ntp-4.2.8p15-cves/issues/1#issuecomment-1506667321Third Party Advisory
→
https://github.com/spwpun/ntp-4.2.8p15-cves/blob/main/CVE-2023-26551Third Party Advisory
→
https://github.com/spwpun/ntp-4.2.8p15-cves/issues/1#issuecomment-1506667321Third Party Advisory
Quick Facts
CVE IDCVE-2023-26551
CVSS Score5.6 / 10
SeverityMEDIUM
WeaknessCWE-787
CISA KEVNo
Affected1 vendor(s)
PublishedApr 11, 2023
Related CVEs (CWE-787)
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2023-26551 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.